ios - Realm 中的双嵌套数组(快速)

Question

我有这个 JSON:

{
"location": {
  "position": {
    "type": "Point",
    "coordinates": [
      45.579553,
      11.751805
    ]
  }
}
}

属于另一个 JSON 对象。

尝试用 Realm 和 ObjectMapper 映射它，我发现很难映射 coordinates 属性，它是一个 double 组。

这就是阅读文档和 S.O.似乎有道理:

import Foundation
import RealmSwift
import ObjectMapper


class Coordinate:Object, Mappable{

dynamic var latitude:Double = 0.0
dynamic var longitude:Double = 0.0

required convenience init?(_ map: Map) {
    self.init()
}
func mapping(map: Map) {
    latitude <- map[""]
    longitude <- map[""]

}


}

class Position: Object, Mappable{

var type:String = ""
var coordinates:Coordinate?

required convenience init?(_ map: Map) {
    self.init()
}
func mapping(map: Map) {
    type <- map["type"]
    coordinates <- map["coordinates"]

}

}

class Location: Object, Mappable{

dynamic var id = ""
dynamic var position:Position?
dynamic var desc = ""

override static func indexedProperties()->[String]{
    return["id"]
}

override class func primaryKey() -> String? {
    return "id"
}


required convenience init?(_ map: Map) {
    self.init()
}

func mapping(map: Map) {
    id <- map["id"]
    position <- map["position"]

}
}

但是，我仍然无法理解如何映射“坐标”对象。请注意，这个问题与 ObjectMapper 本身无关，它更多的是关于如何将 Double 数组分配给 Realm 模型中的属性的问题。

Answer 1

我能够按照这个问题中的指示解决这个问题:

https://github.com/realm/realm-cocoa/issues/1120 (学分@jazz-mobility)

class DoubleObject:Object{

    dynamic var value:Double = 0.0

}

class Position: Object, Mappable{

    var type:String = ""
    var coordinates = List<DoubleObject>()

    required convenience init?(_ map: Map) {
        self.init()
    }

    func mapping(map: Map) {
        type <- map["type"]

        var coordinates:[Double]? = nil
        coordinates <- map["coordinates"]


        coordinates?.forEach { coordinate in
            let c = DoubleObject()
            c.value = coordinate
            self.coordinates.append(c)
        }

    }

}